In order to obtain something, there must be something of equal value. It is the Law of Conservation in Alchemy. Back then, we believed that it was the truth of the world. However, the real world isn’t perfect, so there is not just a single law that governs everything that happens within it. It is the same for the Law of Conservation in Alchemy. Even so, I believe that people cannot obtain something without paying a price. The pain we felt was surely enough of a price to pay. And anyone who pays the price known as hard work surely gains something. The Law of Conservation is not the law governing this
world. Until the day I meet with him again, that is the promise… Ni-san and I made.
From episode 51, time .